MXCHIP has two versions of the datasheet for the module available on their website:
1) Version 1.0, Released on 26 January 2015, in English: http://www.mxchip.com/d/file/2015-03-17/6708fe2d5435a7980a78e66aec369e51.pdf
2) Version 1.1, Released on 5 July 2015, is only available in Chinese: http://pan.baidu.com/s/1mgxhhmo
Looking through the versions, it appears that the latest revision contains additional detail in regards to the antenna (section 5) as well as inserting two new sections with sample schematics of applications before the sales contact info. Hopefully an English version will be released soon.
Also worth mentioning is that there is an index for datasheets and design documents on MXCHIP's Chinese (haven't found a similar page on the English version of the website yet). This will probably be a good place to check for updates and release of new materials: http://www.mxchip.com/wireless/downloadcenter/wifi/32.html